EP3502508A1 - Mâchoire de frein d'un frein à tambour de véhicule - Google Patents

Mâchoire de frein d'un frein à tambour de véhicule Download PDF

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Publication number
EP3502508A1
EP3502508A1 EP18000957.3A EP18000957A EP3502508A1 EP 3502508 A1 EP3502508 A1 EP 3502508A1 EP 18000957 A EP18000957 A EP 18000957A EP 3502508 A1 EP3502508 A1 EP 3502508A1
Authority
EP
European Patent Office
Prior art keywords
cam
brake
side end
plate
brake shoe
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP18000957.3A
Other languages
German (de)
English (en)
Other versions
EP3502508B1 (fr
Inventor
Bernd Schneider
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Gfa Gothaer Fahrzeugachsen GmbH
Original Assignee
Gfa Gothaer Fahrzeugachsen GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Gfa Gothaer Fahrzeugachsen GmbH filed Critical Gfa Gothaer Fahrzeugachsen GmbH
Publication of EP3502508A1 publication Critical patent/EP3502508A1/fr
Application granted granted Critical
Publication of EP3502508B1 publication Critical patent/EP3502508B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D65/00—Parts or details
    • F16D65/02—Braking members; Mounting thereof
    • F16D65/04—Bands, shoes or pads; Pivots or supporting members therefor
    • F16D65/08—Bands, shoes or pads; Pivots or supporting members therefor for internally-engaging brakes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D2125/00—Components of actuators
    • F16D2125/18—Mechanical mechanisms
    • F16D2125/20—Mechanical mechanisms converting rotation to linear movement or vice versa
    • F16D2125/22—Mechanical mechanisms converting rotation to linear movement or vice versa acting transversely to the axis of rotation
    • F16D2125/28—Cams; Levers with cams
    • F16D2125/30—Cams; Levers with cams acting on two or more cam followers, e.g. S-cams
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D51/00—Brakes with outwardly-movable braking members co-operating with the inner surface of a drum or the like
    • F16D51/16—Brakes with outwardly-movable braking members co-operating with the inner surface of a drum or the like shaped as brake-shoes pivoted on a fixed or nearly-fixed axis
    • F16D51/18—Brakes with outwardly-movable braking members co-operating with the inner surface of a drum or the like shaped as brake-shoes pivoted on a fixed or nearly-fixed axis with two brake-shoes
    • F16D51/20—Brakes with outwardly-movable braking members co-operating with the inner surface of a drum or the like shaped as brake-shoes pivoted on a fixed or nearly-fixed axis with two brake-shoes extending in opposite directions from their pivots
    • F16D51/22—Brakes with outwardly-movable braking members co-operating with the inner surface of a drum or the like shaped as brake-shoes pivoted on a fixed or nearly-fixed axis with two brake-shoes extending in opposite directions from their pivots mechanically actuated

Definitions

  • the invention relates to a brake shoe of a cam-operated vehicle drum brake, in particular for drum-braked vehicle axles of commercial vehicles and their trailers.
  • drum brakes are designed in the field of application of vehicles usually as internal drum drum brakes.
  • the braking effect is achieved by the brake shoes are spread outwards, whereby between the outer surfaces of the brake shoes, which are provided with a brake pad, and the inner circumferential surface of the brake drum forms a friction.
  • the force for spreading the brake shoes is usually generated in passenger cars by wheel brake cylinder, while usually found in commercial vehicles brake shafts with cams application in the rotation of the cams act on the brake shoes.
  • cam actuated drum brakes is the possible robust design with low susceptibility to interference, since no wheel brake cylinder must be arranged inside the brake drum.
  • Another advantage is the saving of space for a wheel brake cylinder. Disadvantages are the increased stresses on the brake shoes in the region of the force transmission of the cams on the brake shoes, since additional shear forces arise as a result of the rotation of the cams.
  • the object of the invention is to provide a brake shoe of a cam-operated vehicle drum brake, which has an increased reliability and durability and is inexpensive to produce.
  • a generic brake shoe of a cam-operated vehicle drum brake has a lining plate and a web plate as supporting components.
  • the lining sheet is curved in a part-circular manner. It is also called a pad carrier or back plate.
  • the lining plate On its outside, the lining plate carries the brake pad.
  • the curvature of the outside of the lining plate corresponds to the curvature of the inner circumferential surface of the brake drum with which the brake shoe cooperates when used as intended.
  • the outside is the convexly curved side of the lining plate.
  • the web plate is arranged on the inside of the lining plate.
  • the inside is the concavely curved side of the lining plate.
  • the contour of the web plate follows the curvature of the lining plate.
  • the pad plate and the web plate are connected together.
  • the lining plate and the web plate are connected to each other, for example by welding. However, the realization in one component is also possible.
  • the web plate is arranged opposite to the lining sheet such that a T-shaped cross-section results in a main portion.
  • the lining sheet forms the flange and the web plate the web of the T-section.
  • the web plate is preferably arranged approximately centrally to the transverse extent of the lining plate.
  • the brake shoe also has two opposite end portions. It is on the one hand to a bearing-side end portion, with which the brake shoe is supported on a bearing pin.
  • the bearing pin is part of a brake carrier assembly.
  • it is a cam end section. At the cam-side end portion, a compressive force can be introduced into the brake shoe.
  • the pressure force is provided by a brake cam, by this twisted by a brake actuation means of the brake shaft.
  • the brake cam does not act directly on the web plate in the cam-side end portion, but via a cam roller which is mounted in a part-circular recess of the web plate.
  • Brake carrier assembly with bearing pin, brake cam, cam roller and brake shaft act with the invention Brake shoe together. However, they are not part of the brake shoe according to the invention.
  • the brake shoe according to the invention is characterized in that the web plate on the cam-side end portion has a projection, which covers a cam-side end face of the lining sheet at least partially in an overlapping surface and is supported on the overlap surface on the cam-side end face of the lining sheet.
  • the projection extends over a continued in the direction of the cam end portion curved connecting line of pad plate and web plate in the eccentric radial direction.
  • the projection is located at a portion of the web plate on which the web plate is continued beyond the pad plate.
  • the overlapping surface denotes the surface on which the projection overlaps the cam-side end face of the lining plate.
  • the overlapping surface thus covers a partial surface of the cam-side end face.
  • the projection on the front side of the lining plate is supported. This means that the projection is designed so that you can transmit to the overlay surface, a force resulting from the registered by the brake cam force on the pad plate.
  • the overlapping surface may be formed as a mere pressure-contact surface.
  • the web plate is subject in the cam-side end region considerable bending stresses, in particular in the region of the part-circular recess for the Cam roller. By transferring the force to the lining plate, the web plate is relieved and the stresses are significantly reduced.
  • the overlapping area extends over the entire width of the cam-side end face.
  • the width of the cam-side end face is to be understood as the radial extent thereof.
  • the width of the cam-side end face is thus determined by the thickness of the lining sheet.
  • Fig. 1 to 2a show, in the embodiment of a brake shoe cam-actuated vehicle drum brake, the brake shoe on a pad plate 1 and a web plate 2.
  • the lining sheet 1 is curved in the shape of a pitch circle. It has a convex outside 1.1 and a concave inside 1.2.
  • the web plate 2 also has a part-circular contour.
  • the pad plate 1 and the web plate 2 are welded together.
  • the brake shoe can also be made of one part.
  • the plane of the web plate 2 is arranged at right angles to the curved plane of the lining plate 1.
  • the web plate 2 is welded to the inside 1.2 of the lining plate.
  • the brake lining is located on the outside 1.1 of the lining sheet 1, wherein this is not shown in the figures.
  • Fig. 1 shows, the pad sheet 1 and the web plate 2 form a T-section.
  • the brake shoe has an approximately central main section 3 and a bearing-side end section 4 and a cam-side end section 5, which each adjoin the main section 3. At the bearing-side end portion 4, the brake shoe is supported on a bearing pin of a brake carrier of a commercial vehicle axle.
  • the Lagerseltigen end portion 4 opposite is the cam-side end portion 5.
  • the web plate 2 in the exemplary embodiment on the cam-side end portion 5 a part-circular recess in which a cam roller is mounted.
  • the cam roller is in not shown in the figures.
  • a compressive force is transmitted to the brake shoe at an intended use in a brake actuation of a brake cam, which presses it against the inside lateral surface of a brake drum.
  • the web plate 2 at its cam-side end portion 5 also has a projection 6.
  • the projection extends beyond a continuous line 6 of the connecting line between the web plate 2 and the pad plate 1.
  • the projection 6 is so far brought to an end face 1.3 of the pad plate 1 and has such a contour that they with a part of its contour surface on the Face 1.3 of the lining sheet 1 is applied, so that a pressure contact exists.
  • This surface is the overlap area 7. Via this overlap area, a force can be introduced from the web plate 2 onto the end face 1.3 of the lining sheet 1.
  • the material stresses in the web plate 2 are reduced to such an extent that component failure due to overstress can be reliably avoided when used as intended.
  • the overlap area 7 extends over the entire width of the end face 1.3.
  • Fig. 3 and 3a represent a web plate of a design according to the prior art and show the generic structure.
  • Fig. 3a can recognize, a projection according to the prior art does not exist and it can not be transmitted to the end face of a lining plate force.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Braking Arrangements (AREA)
EP18000957.3A 2017-12-21 2018-12-10 Mâchoire de frein d'un frein à tambour de véhicule Active EP3502508B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE202017006610.6U DE202017006610U1 (de) 2017-12-21 2017-12-21 Bremsbacke einer Fahrzeug-Trommelbremse

Publications (2)

Publication Number Publication Date
EP3502508A1 true EP3502508A1 (fr) 2019-06-26
EP3502508B1 EP3502508B1 (fr) 2021-03-03

Family

ID=64664840

Family Applications (1)

Application Number Title Priority Date Filing Date
EP18000957.3A Active EP3502508B1 (fr) 2017-12-21 2018-12-10 Mâchoire de frein d'un frein à tambour de véhicule

Country Status (2)

Country Link
EP (1) EP3502508B1 (fr)
DE (2) DE202017006610U1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3650360A (en) * 1969-12-30 1972-03-21 Robert L King Truck brake
EP0251545A1 (fr) * 1986-06-20 1988-01-07 Rubery Owen-Rockwell Limited Dispositif de frein
US4732240A (en) * 1987-04-10 1988-03-22 General Motors Corporation Drum brake assembly, brake shoes for same, and method
DE102014218938A1 (de) * 2014-09-19 2016-03-24 Knott Gmbh Bremsvorrichtung und Bremsbacke

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1656607A (en) * 1926-04-26 1928-01-17 Studebaker Corp Brake
GB397874A (en) * 1932-02-26 1933-08-28 Gerald Ayshford Pole Carew Improvements in or relating to brakes
AU545301B2 (en) * 1980-10-22 1985-07-11 Akebono Brake Industry Co., Ltd. Pad type drum brake
JP2000145850A (ja) * 1998-11-13 2000-05-26 Honda Motor Co Ltd ブレーキシュー及びその製造方法
US20070056816A1 (en) * 2006-11-30 2007-03-15 Arvinmeritor Technology, Llc Brake assembly with rust jacking

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3650360A (en) * 1969-12-30 1972-03-21 Robert L King Truck brake
EP0251545A1 (fr) * 1986-06-20 1988-01-07 Rubery Owen-Rockwell Limited Dispositif de frein
US4732240A (en) * 1987-04-10 1988-03-22 General Motors Corporation Drum brake assembly, brake shoes for same, and method
DE102014218938A1 (de) * 2014-09-19 2016-03-24 Knott Gmbh Bremsvorrichtung und Bremsbacke

Also Published As

Publication number Publication date
DE202017006610U1 (de) 2019-03-22
DE102018009668A1 (de) 2019-06-27
EP3502508B1 (fr) 2021-03-03

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